79923839 has 2 divisors, whose sum is σ = 79923840. Its totient is φ = 79923838.

The previous prime is 79923791. The next prime is 79923853. The reversal of 79923839 is 93832997.

It is a strong prime.

It is an emirp because it is prime and its reverse (93832997) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 79923839 - 2²⁰ = 78875263 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (79923889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39961919 + 39961920.

It is an arithmetic number, because the mean of its divisors is an integer number (39961920).

Almost surely, 2^79923839 is an apocalyptic number.

79923839 is a deficient number, since it is larger than the sum of its proper divisors (1).

79923839 is an equidigital number, since it uses as much as digits as its factorization.

79923839 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 734832, while the sum is 50.

The square root of 79923839 is about 8940.0133668804. The cubic root of 79923839 is about 430.7501580081.

The spelling of 79923839 in words is "seventy-nine million, nine hundred twenty-three thousand, eight hundred thirty-nine".